Biology: The Dynamics of Life, North Carolina Edition

Section 3: Life Substances

Life Substances

1
Which of these is considered to be one indicator of a person's risk of heart disease?
A)low HDL levels
B)the ratio of HDL to LDL
C)high LDL levels
D)the ratio of LDL to HDL
2
Which organ in a mammal is responsible for storing glycogen?
A)bladder
B)lungs
C)liver
D)brain
3
Which of these is a protein?
A)table sugar
B)nucleic acid
C)a fingernail
D)wax
4
Which of these elements is NOT part of a carbohydrate molecule?
A)hydrogen
B)oxygen
C)carbon
D)magnesium
5
Compounds that have different three-dimensional structures but identical chemical formulas are called __________.
A)acids
B)carbohydrates
C)isomers
D)enzymes
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